You can see the electrolysis of water by immersing the top of a disposable 9-V battery in

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You can see the electrolysis of water by immersing the top of a disposable 9-V battery in salt water. The  bubbles that form contain hydrogen gas produced as the water decomposes. Why does this activity work better with salt water than with tap water? Sharpen both ends of two pencils. Hold a pencil tip to each electrode while submerging the opposite ends of the pencils into salt water. Why does one electrode put out twice as much gas as the other?

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Conceptual Physical Science

ISBN: 978-0134060491

6th edition

Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt

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